Voximplant

Overview

Voximplant runs a serverless communications platform where call logic is written in its VoxEngine JavaScript runtime and connects phone calls, SIP trunks, WhatsApp Business Calling and in-app voice and video. Its voice AI layer links calls to OpenAI Realtime, Gemini Live, ElevenLabs Agents, Deepgram and other models. Voximplant Kit is a separate contact center product.

Key features

• Phone number API, SIP trunking, number masking and answering machine detection
• Voice AI with turn detection and an MCP client that connects voice agents to external tools
• Two-way SMS on supported numbers, plus one-way A2P sending with a sender ID that support installs
• Inbound SMS posted to your backend as an HTTP callback
• Web, iOS, Android and Flutter SDKs
• States GDPR and HIPAA compliance and ISO 27001 certification

Pricing

Pay as you go. In the US, numbers cost $1.50 a month plus $1.50 setup, inbound calls $0.005 a minute, outbound calls from $0.017 a minute, and SMS $0.016 per message in or out. Two-way SMS cannot be used for bulk or service messages; A2P sending is billed separately.

How it compares to Linq

Voximplant has no iMessage or RCS. It places and answers calls and runs voice AI agents, while Linq's API only forwards inbound calls. Linq charges a flat fee from $260 a month with no per-message fees; Voximplant bills per minute and per message.

Best for

Developers building voice AI agents or call flows who also need basic SMS on the same numbers.

Sources

• voximplant.com
• voximplant.com/about
• voximplant.com/pricing
• voximplant.com/docs/guides/sms
• voximplant.com/docs/guides/sms/sending
• voximplant.com/docs/guides/sms/receiving
• voximplant.com/docs/guides/sms/phonenumbers
• voximplant.com/blog/voxengine-mcp-client